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19912026
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928 papers · 1 filter

astro-ph.CO2026

A census of Dark Energy Survey Year 3 redMaPPer galaxy clusters in a high exposure eROSITA All Sky Survey region

P. A. Giles, A. K. Romer, J. Pilling +64

We present the cross-match of galaxy clusters detected by redMaPPer using the first three years of Dark Energy Survey (DESY3RM) operations, and the first release of the eROSITA-All…

astro-ph.CO2026★ 3 cited

The DESI DR1 Peculiar Velocity Survey: growth rate measurements from the maximum likelihood fields method

Y. Lai, C. Howlett, J. Aguilar +60

We present the constraint on the growth rate of structure from the combination of DESI DR1 BGS sample, Fundamental Plane, and Tully-Fisher peculiar velocity catalogues using the ma…

astro-ph.CO2026★ 4 cited

An ultra-high-resolution map of (dark) matter

Diana Scognamiglio, Gavin Leroy, David Harvey +38

Ordinary matter-including particles such as protons and neutrons-accounts for only about one sixth of all matter in the Universe. The rest is dark matter, which does not emit or ab…

astro-ph.CO2026

Dynamical Dark Energy Imprints in the Lyman-Alpha Forest

Diego Garza, Brant Robertson, Piero Madau +7

The nature of dark energy (DE) remains elusive, even though it constitutes the dominant energy-density component of the Universe and drives the late-time acceleration of cosmic exp…

astro-ph.CO2025★ 1 cited

SN 2025ogs: A Spectroscopically-Normal Type Ia Supernova at z = 2 as a Benchmark for Redshift Evolution

M. R. Siebert, J. D. R. Pierel, M. Engesser +20

The Nancy Grace Roman Space Telescope will provide a revolutionary measurement of the Universe's expansion kinematics, driven by dark matter and dark energy, out to .…

astro-ph.CO2025

The DESI DR1 Peculiar Velocity Survey: Fundamental Plane Catalogue

C. E. Ross, C. Howlett, J. R. Lucey +58

Measurements of peculiar velocities in the local Universe are a powerful tool to study the nature of dark energy at low () redshifts. Here we present the largest single se…

astro-ph.CO2025

Full calibration of the tomographic redshift distribution from the HSC PDR3 Shape Catalog with DESI

J. Choppin de Janvry, S. Gontcho A Gontcho, U. Seljak +53

The calibration of tomographic redshift distributions is essential for cosmological analysis of weak lensing data. In this work, we calibrate all four tomographic bins of the Hyper…

astro-ph.CO2025★ 2 cited

Impact of projection-induced optical selection bias on the weak lensing mass calibration of galaxy clusters

Titus Nyarko Nde, Hao-Yi Wu, Shulei Cao +4

Weak gravitational lensing signals of optically identified clusters are impacted by a selection bias -- halo triaxiality and large-scale structure along the line of sight simultane…

astro-ph.CO2025★ 1 cited

Primordial black holes versus their impersonators at gravitational wave observatories

Andrea Begnoni, Stefano Profumo

The detection of primordial black holes (PBHs) would mark a major breakthrough, with far-reaching implications for early universe cosmology, fundamental physics, and the nature of…

astro-ph.CO2025★ 6 cited

Looking beyond lambda

Alexie Leauthaud, Adam Riess

Widening cracks are appearing in the CDM model and it is becoming increasingly clear that the standard cosmological model struggles to describe the full expansion history of the…

astro-ph.CO2025★ 4 cited

A Constraint on Dark Matter Self-Interaction from Combined Strong Lensing and Stellar Kinematics in MACS J0138-2155

Jackson H. O'Donnell, Tesla E. Jeltema, M. Grant Roberts +3

Self-Interacting Dark Matter (SIDM) represents a compelling alternative to collisionless dark matter, with diverse phenomenological signals from dwarf galaxy to galaxy cluster scal…

astro-ph.CO2025★ 2 cited

Association between optically identified galaxy clusters and the underlying dark matter halos

DES Collaboration, Shulei Cao, Hao-Yi Wu +10

Clusters of galaxies trace massive dark matter halos in the Universe, but they can include multiple halos projected along lines of sight. As a case study, we quantify the propertie…

astro-ph.CO2025★ 1 cited

Spectroscopic Characterization of redMaPPer Galaxy Clusters with DESI

J. Myles, D. Gruen, T. Jeltema +44

Optical galaxy cluster identification algorithms such as redMaPPer promise to enable an array of astrophysical and cosmological studies, but suffer from biases whereby galaxies in…

astro-ph.CO2025★ 2 cited

Characterising the Standardisation Properties of Type Ia Supernovae in the z band with Hierarchical Bayesian Modelling

Erin E. Hayes, Suhail Dhawan, Kaisey S. Mandel +21

Type Ia supernovae (SNe Ia) are standardisable candles: their peak magnitudes can be corrected for correlations between light curve properties and their luminosities to precisely e…

astro-ph.CO2025★ 62 cited

Dynamical Dark Energy in light of the DESI DR2 Baryonic Acoustic Oscillations Measurements

Gan Gu, Xiaoma Wang, Yuting Wang +57

Understanding whether cosmic acceleration arises from a cosmological constant or a dynamical component is a central goal of cosmology, and the Dark Energy Spectroscopic Instrument…

astro-ph.CO2025★ 1 cited

Validation of the DESI DR2 Measurements of Baryon Acoustic Oscillations from Galaxies and Quasars

U. Andrade, E. Paillas, J. Mena-Fernández +116

The Dark Energy Spectroscopic Instrument (DESI) data release 2 (DR2) galaxy and quasar clustering data represents a significant expansion of data from DR1, providing improved stati…

astro-ph.CO2025★ 3 cited

Deep Chandra observations of PLCKG287.0+32.9: a clear detection of a shock front in a heated former cool core

M. Gitti, A. Bonafede, F. Brighenti +9

The massive, hot galaxy cluster PSZ2 G286.98+32.90 (hereafter PLCKG287, z=0.383) hosts a giant radio halo and two prominent radio relics which are signs of a disturbed dynamical st…

astro-ph.CO2025★ 29 cited

Data Release 1 of the Dark Energy Spectroscopic Instrument

DESI Collaboration, M. Abdul Karim, A. G. Adame +306

In 2021 May the Dark Energy Spectroscopic Instrument (DESI) collaboration began a 5-year spectroscopic redshift survey to produce a detailed map of the evolving three-dimensional s…

astro-ph.CO2025★ 539 cited

DESI DR2 Results II: Measurements of Baryon Acoustic Oscillations and Cosmological Constraints

DESI Collaboration, M. Abdul-Karim, J. Aguilar +184

We present baryon acoustic oscillation (BAO) measurements from more than 14 million galaxies and quasars drawn from the Dark Energy Spectroscopic Instrument (DESI) Data Release 2 (…

astro-ph.CO2025★ 2 cited

The Spectroscopic Stage-5 Experiment

Robert Besuner, Arjun Dey, Alex Drlica-Wagner +106

The existence, properties, and dynamics of the dark sectors of our universe pose fundamental challenges to our current model of physics, and large-scale astronomical surveys may be…

astro-ph.CO2025★ 6 cited

Cosmology with second and third-order shear statistics for the Dark Energy Survey: Methods and simulated analysis

R. C. H. Gomes, S. Sugiyama, B. Jain +56

We present a new pipeline designed for the robust inference of cosmological parameters using both second- and third-order shear statistics. We build a theoretical model for rapid e…

astro-ph.CO2025★ 11 cited

Dark Energy Survey Year 6 Results: Point-spread Function Modeling

T. Schutt, M. Jarvis, A. Roodman +70

We present the point-spread function (PSF) modeling for weak lensing shear measurement using the full six years of the Dark Energy Survey (DES Y6) data. We review the PSF estimatio…

astro-ph.CO2025★ 9 cited

Dark Energy Survey Year 6 Results: Synthetic-source Injection Across the Full Survey Using Balrog

D. Anbajagane, M. Tabbutt, J. Beas-Gonzalez +79

Synthetic source injection (SSI), the insertion of sources into pixel-level on-sky images, is a powerful method for characterizing object detection and measurement in wide-field, a…

astro-ph.CO2024

The DESI-Lensing Mock Challenge: large-scale cosmological analysis of 3x2-pt statistics

C. Blake, C. Garcia-Quintero, S. Ahlen +41

The current generation of large galaxy surveys will test the cosmological model by combining multiple types of observational probes. Realising the statistical promise of these new…